Question : What is the approximate rate of simple interest per annum, if a sum of money becomes 6 times of itself in 15 years?
Option 1: 30%
Option 2: 2.5%
Option 3: 33.33%
Option 4: 25%
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Correct Answer: 33.33%
Solution : Simple interest = $\frac{\text{Principal × Rate × Time}}{100}$ Let the Principal amount be $P$ and the interest rate be $R$% per annum. Simple interest = 6$P – P$ = 5$P$ So, 5$P$ = $\frac{PR × 15}{100}$ ⇒ R = $\frac{500}{15}\approx$ 33.33% Hence, the correct answer is 33.33%.
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